content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.*;
  
  final class IxReplay<T> extends IxSource<T, T> {
  
      List<T> list;
  
      Iterator<T> it;
  
      IxReplay(Iterable<T> source) {
          super(source);
      }
  
      @Override
      public Iterator<T> iterator() {
          if (it == null) {
              it = source.iterator();
          }
          return new ReplayIterator<T>(this);
      }
  
      boolean moveNext() {
          if (!it.hasNext()) {
              return false;
          }
  
          List<T> list = this.list;
          if (list == null) {
              list = new ArrayList<T>();
              this.list = list;
          }
  
          list.add(it.next());
          return true;
      }
  
      static final class ReplayIterator<T> extends IxBaseIterator<T> {
  
          final IxReplay<T> parent;
  
          int index;
  
          ReplayIterator(IxReplay<T> parent) {
              this.parent = parent;
          }
  
          @Override
          protected boolean moveNext() {
              int i = index;
              List<T> list = parent.list;
  
              if (list == null || i == list.size()) {
                  if (!parent.moveNext()) {
                      done = true;
                      return false;
                  }
                  if (list == null) {
                      list = parent.list;
                  }
              }
              index = i + 1;
              value = list.get(i);
              hasValue = true;
              return true;
          }
      }
  }
  